Souvenirs from across the globe adorn walls and shelf space all over the house.
"I have to buy small things, because it's hard to fit much in a rucksack" says Christine.
Memories are more precious though. One experience she might rather forget is the day she climbed Japan's Mount Fuji – while Mike waited for two days back at their hotel in Kyoto – and lost the path in bad weather.
"I was crawling on my hands and knees and wondering what would happen if I broke my leg or worse."